Pump



Feb. 22, 1927.- ,333

L. B. GREEN PUMP Filed April 10. 1925 4 Sheets-Sheet 1 gwvwntoz L. B.GREEN Feb. 22, 1927.

PUMP

Filed April 10. 1925 4 Sheets-Sheet 2 gnvexnfoz,

67% 515 M,MW9

GU 0: M118 1.. B. GREE-N Feb. 22-, 192 7.

PUMP

Filed Appil 10. 1925 4 Sheets-Sheet 5 mm. Mum Mi atto'zvwg L. B. GREENPUMP Feb. 22, 1927. 1,618,333

Filed April 10. 1925 4 Sheets-Sheet 4 Patented at 22.1927.

. UNITED STATES PATENT OFFICE.

LEE 2B.'GR'I':.E1\T, oE'LAxEwoon, 01110, AssIeivon or" ONE-THIRD 'ro EmL. JONES, or"

CLEVELLND, O HIO; ONE-THIRD '10 CASSIUS L. FINNEY, OF CANTON, ONE-THIRDTO'OONRAD B. KRAUSE, OF CLEVELAND, OHIO.

OHIO; AND

PUMP.

Application filed April 10, 1925. Serial No. 22,117.

This invention relates to pumps and more at especiall to pumps for useinconnection with re rigeratingapparatus for compressing' the gas whichis used as the refrigerant.

The present invention is an improvement over the invention described andclaimed in mMy earlier application No. 697,264, filed arch6,192. h

It is one of the objects of the invention 1 to provide an improvedvconstruction em-.

bodying a plurality of oscillating cylinders so arranged that theefficiency "of the pump will be maintained over long periods of use.

A further object of the invention is'to provide a constructiomof thetype ,referred to,

that may be quickly and easily assembled and disassembled and'inwhichthe moving parts are arranged in a sectional housing,

the sectionslof which are of simple design,

easily machined'and so secured together that they may readilydisassembled when necessary. A further object of the inven- .tion is toprovide a pump construction, of

the type referred to, 111-' which the operating shaft is mounted inbearings in a section of the housingthat constitutes a separate unitpermitting the cylinders, pistons and high and lowpressure chambers toberemoved without disturbing the shaft or its bearings. Anotherbbject ofthe invention is to provide an improved form of sealing means forpreventing leakage from the high pressure chamber along the shaft to thechamber containing the shaft bearings. A

Other objects of the invention-and the features of novelty will beapparent from the following description taken in connection with theaccompanying drawings, of which:

Figure 1 is a pump embodying my invention;

Fig. 2 isva plan view with the upper hous-l ing section removed. p 1

Fig. 3' is a sectiolrsubstantially on the line 3-4; of Fig.1;

Fig. 4 isan, enlarged'section on the line Hof' Figal'; I f Fig. 5 is alongitudinally section on the line;55 of Fig.4

Fig.. 6 is anenlarged section on the line 6-6ofFig.1; and--- p Fig. 7 isa. perspective view of'a novel form of sealing ring which I em loy.

Referring to the drawings 10 indicates the a longitudinal sectionthrough base section of a housing having a shaft 11 arranged verticallytherein and supported 3 by the bearings 12 and 13. The bearing 12 isarranged in a sleeve 14 which projects upwardly: from the bottom of thehousing section 10 and the bearing 13 is a combined radialand't'hrustbearing that is carried in a ring 15 that is'formedintegral'with the housing section 10 and supported therein by thebrackets 16. The ring 15 has an internal flange 16' which engages oneside of thebearing 13, the bearing being clamped "against-this flange by'means of the ring 17 and the-screws '18. A worm gear 19 is keyed to theshaft 11 and driven by means of a worm 20 on the .driving shaft 21. The

inner member of the bearing 13 engages with a collar 22 on the shaft'11, being pressed ther'eagainst by the gear 19 which engages theopposite side of the bearing. A spacer 23 is arranged on the shaft 11between the gear 19 and-the bearing 12 and a nut24 on the lower end ofthe shaft secures the parts in position, as best shown in' Fig. 5.

Theshaft 21 is supported in the bearmgs 26 and 27, the latter being acombined radial and thrust bearing. The shaft 21' extends through astufiing box 28 to the exterior of the housing section 10 and hassecured on y the outer end thereof a driving pulley 29 which may bedriven from a "motor or other source, of power by means of a belt.Adjacent to the bearing 26' the housing section '10 has an opening 30througli which the' shaft 21 ma be removed, this-opening being closed ya cover plate 31 which is secured in position by the bolts 32.

The housing sect on -10 has a laterally extending flange 33 whichsupports a hollow partition section constituting the low pressurechamber of .the pump, this partition section consisting of the member 34and the plate'35 Abovethe artition section there having a flange 37Bolts 38extend throng the. flanges 33- and 37 and the member 34 s adome-shaped section 36, of the housin l The bolts 38 are so located astobe readily removable and permit the 'de'mounting of the several sectionsof the housing. In the specific embodiment of the invention illus-'trated in the drawings there are'three horizontally arrangedoscillating cylinders '39,

40 and 41 each of which is provided with a pair of trunnions, one on itslower side and the other on its upper side, one of the lower trunnionsbeing indicated at 42, in

Fig. 1 and one of the upper trunnions be ing indicated at 43. Thetrunnions 42 engage bearings 44 in the member 34 and the trunnions 43engage bearings 45 in the pressure plate 46 that rests upon the uppersides of the cylinders 39, 40 and 41.

Each of the cylinders 39, 40 and 41 has a port 47 in its lower side,adjacent the end of the cylinder which cooperates with a port 48, in theupper wall of the member 34, for the purpose of controlling the intakefrom the low pressure chamber 49 to the interior of the cylinder. Thecylinders are also provided with ports 50 in their upper walls which areadapted to communicate with ports 51 in the pressure plate 46 andcontrol the discharge of compressed gas from the cylinders.- The plate46 is formed with upward projections 52, one for each of the ports 51,for the purpose of conveying the compressed gas to a point above thesurface of the lubricating oil with which the high pressure chamber 53is filled to a point slightly above the upper surface of the plate 46as, for example, the level of the line 54. The housing section 36 has anoutlet opening for the compressed gas at 55 and a pipe may be secured inthis opening and run to the apparatus with which the pump is associated.Each of the cylinders 39, 40 and 41 contains a piston 56 and thesepistons have yokes 57, 58 and 59, respectively, that engage an eccentricpin or crank 60 onthe enlarged head 61 at the upperend of the shaft 11.

In order to guide the pressure plate 46, I provide rods or guides 62, 63and 64 which are secured in the member 34, project upwardly therefrom,and have sliding en agement with the plate 46. The upper ends of theguides 62, 63 and 64 carry a triangular plate 65, which is securedthereto by the screws 66. This plate 65, carries at its center, a setscrew 67 the lower end of which engages asmall plate 68 against whichabuts the upper end of a spring 69, the lower end of this spring beingseated in a cavity 70, at the center of the pressure plate 46, so thatthe spring forces the pressure plate against the cylinders 39, 40 and 41and the latter against the member 34, thereby maintaining tight jointsat the points of relative movement of these parts.

I11 order to seal the space between the shaft 11 and the partitionformed by the members 34 and 35, I provide a ring 71, of anti-frictionmaterial, such as bronze, on the upper side of the collar 22 and secureto the upper side of this ring, by soldering or otherwise, a flexiblemetal diaphragm 72 the outer peripheral portion of which is clamped insealing engagement with the lower side of the plate 35 by means of aring 73 and screws 74. The face of the ring 71, which contacts with thecollar 22, has a groove 75 therein that is, arranged eccentric to theaxis of the ring and filled with a lubricating composition, which Iprefer to make in the form of a paste from beeswax, pulverized Babbittmetal and graphite. The eccentricity of the groove 75 insures adequatelubrication of practically the entire surface of the joint between thering 71 and the collar 22.

The flexible diaphragm 72 is preferably made as shown in Fig. 1, with agroove 76 in its upper side, this groove being adapted to trap any ofthe condensed refrigerant which accumulates in the high pressurechamber, when the pump is shut down, and drains onto the diaphragm, thenature of the refrigerant being such that if it were not trapped andwere allowed to reach the joint between the ring 71 and the collar 22,it would find its way through this joint into the gear chamber and causea serious deterioration of the mechanism therein.

The pressure in the high pressure cham ber 53, acting on the uppersurface of the diaphragm 72, serves to press the ring 71.

against the collar 22 and maintain a tight joint therebetwcen and, sincethe suction in the pump cylinders is never applied to the diaphragm,there is no possibility of the pump drawing air into the apparatusthrough the joint between the ring 71 and the collar 22, thisarrangement, therefore, overcoming one of the serious objections topumps as heretofore constructed. As a precautionary measure and toinsure proper contact between the ring 71 and the collar 22, when thereis no pressure in the chamber 53, I provide a spring 77 around theenlargement 61 of the shaft 11, the lower end of this spring engagingthe ring 71 and the upper end engaging the member 34, as

clearly shown in Fig. 1.

It will be noted from Figs. 1 and 6 that raised surfaces 78 are providedon the upper side of the member 34 on which the cylinders 39, 40 and 41operate. These surfaces 78 have their inner ends connected by short ribs79, thus forming shallow pockets 80 on the upper side of the members 34,between the cylinders, these pockets serving as means for trapping, someof the condensedrefrigerant that accumulates in the high pressurechamber. It will be understood that in the operation of a pump of thischaracter, whenever the pump is shut down some of the compressedrefrigerantv condenses and in order to provide means for collecting thiscondensed refrigerant and keeping it away from the vital parts of thepump, I have provided the pockets 80, and the groove 76 in the upperside of the diaphragm 72. While these places that I have provided forthe accumulation of condensed refrigerant are of relatively smallcapacity, they are ample for the pur ose since, in any case, there isonly a re atively small amount of condensation to be taken care of. Whenthe pump is started up again the heat that is generated therein willevaporate the accumulations of condensed refrigerant.

Having thus described my invention, what I claim is: p 1. In umps, thecombination of a support, a plura ity of oscillating cylinders bearingagainst said support, a piston in each of said cylinders, a shaft havinga crank operatively connected with said pistons, a floating memberengaging the sides of said cylinders opposite said support and havingports with which ports in said cylinders cooperate, said cylinders beingprovided with trunnions engaging bearings in said supportand saidmember, respectively, guiding means inde pendent of said trunnions forholding said member from rotatingand on which it may slide axially ofsaid shaft, and spring means for pressing said member against saidcylinders.

2. In pumps, the combination of a support, a plurality of oscillatingcylinders the'latter and on which the member is slid-- able axially ofsaid shaft, a plate carried by said rods, and a spring between saidplate and said member for pressing the latteragainst said cylinders.-

3. In pumps, the combination of a support, a plurality of oscillatingcylinders bearing against said support, a piston in cylinders oppositesaid support and having ports with which ports in said cylinders 00-,

operate, said cylinders being provided with trunnions engaging bearingsin said support and said member, respectively, a plurality of guide rodssecured to said support between said cylinders and extending parallelwith said shaft and through said member to hold the latter againstrotation but permit it to slide axially of the shaft, a plate carried bysaid rods, a spring between said plate and said member, and adjustingmeans on said plate for varying the pressure of said member on saidcylinders.

4. In pumps, the combination of a hollow support forming a rlow-pressure chamber having ports through one of its walls, a pluralityof oscillating cylinders resting on said support and having portscertain of which are adapted to registenwith the first-men- 3 tionedports to control the intake of said cylinders, a piston in each of saidcylinders,

a shaft extending through said support and having a crank operativelyconnected with 'said piston, a floating member engaging the sides ofsaid cylinders opposite said sup ort and having ports which are adapt toregister with certain of said cylinder ports to control the dischargefrom said cylinders, said cylinders being provided with trunnionsengaging bearings in said support and said member, respectively, guidingmeansindependent of said trunnions for holding said member againstrotation and on which it may slide axiall of said shaft, a plate carrieby said gui' ing means, a spring between said plate andsaid member forpressing the member against said cylinders, and a housing secured onsaid support and enclosing the otherparts mentioned and forming with vthe support a high-pressure chamber into received.

In testimony whereof I aflix my s' ature.

, LEE B. GR EN.

which the discharge from said cylindersis

